Nostalgic Japanese Children’s drink in Strawberry, Grape, or Lemon-lime.
In a saucepan, combine granulated sugar and water. Heat over medium heat, stirring until the sugar completely dissolves. Remove from heat.
Once the syrup has cooled, add the desired flavoring (strawberry, grape, or lemon-lime) and citric acid. Stir well to combine.
In a large pitcher, mix the syrup with carbonated water. Adjust the sweetness or flavor intensity as desired.
If desired, add food coloring to achieve a more vibrant color. Stir gently to mix.
Pour the Ramune into bottles or glasses. Place a marble in each glass for a nostalgic touch. Serve chilled.